Vestel 17mb61-2 I screwed up my TV

[oldschoolgamer]

So I tried to update this walker TV to see if it would help with the white balance being off but now only one HDMI works and there's no sound. I flashed it using the 3 files on the USB and holding down ok. The panel type I have is a 37" LG. Currently the firmware thinks it's 40 and not 37 if that might be part of the problem. The sound worked fine until the update and now nothing. Has anyone any idea where I might find another variation of the firmware for this TV please?

I updated from 1.2.9 to 1.4.2.

I also backed up the NV before it happened and have like 7 files if that's helpful.

Thanks

EDIT: I also took the TV apart beforehand and confirmed that it's definitely a 17mb61-2 mainboard.

[diif]

Re: Vestel 17mb61-2 I screwed up my TV

Did it fix the white balance ? What TV is it ? What was it you flashed, from where ?

[oldschoolgamer]

Did it fix the white balance ? What TV is it ? What was it you flashed, from where ?

I searched all over the net it's very hard to find files. Anyway the LCD just has the slight tint and I'll settle for it but none of the files I've tried will fix it. the first one I tried was from this forum. It's for 17MB61-2 and contained 3 files. The closest I've been to having it work again was accidentally flashing a 17mb61-3 firmware and it had sound but the screen was flipped 180 degrees upside down. I have no idea where to find it but the TV is called walker and the model is wp3711lcd. It's a 37" TV and it has an LG panel.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

OK so I left it unplugged overnight and now today the red led won't light up and the tv shows no sign of life but has power. You can hear the psu making noise and the side touch panel beeps when you press it so that's still responding. Is this fixable now or for the bin? The biggest question is what caused this because the mboot was working last night apart from the panel glitches due to the wrong firmware.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

I have no idea what happened but it looks like a corrupt eeprom. Basically there's no light anymore and the only reaction from the TV is the beep when you press the side panel.

Since I left out so much information, the label on the board reads as follows.

10071121 20538065 12 37"

26697411 LGEWUN-SCC1 IE
V1290 MB61

The PSU is 17PW26-5

Anyway since now the TV decided to not power on at all anymore and it's impossible to find the exact same board, can I just buy another board and try different firmwares while leaving the mboot.bin out?

I haven't got a lot of money so this has to do me for a few weeks at least if I can get it to work again.

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

You can try using the RS232 port on the TV to log in and access settings and possibly load new panel data onto the unit.

See here
https://www.badcaps.net/forum/showthread.php?t=62824

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

You can try using the RS232 port on the TV to log in and access settings and possibly load new panel data onto the unit.

See here
https://www.badcaps.net/forum/showthread.php?t=62824

Thanks for the reply. I have no problem using a scart and cutting it to make some sort of cable but how would I get the 3.3v line as said in the post linked? I get no sign of life so I'd imagine I'd need to reload the mboot to the tv I assume it got corrupted. Do I need a USB to com port adapter to make this connection or is it possible to build your own connection somehow?

Sorry for all the questions I'm just a bit new to this and really can't afford a new tv at the minute. I really should have just left it alone. Can the bin files themselves have panel info edited also if it comes to buying a new board and I can't make the com connection work?

Edit: Is this what I need?

http://m.ebay.ie/itm/USB-2-0-6-Pin-t...%257Ciid%253A1

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

This is probably something for an advanced user, not someone trying to fix their TV without much experience. You will need to know Linux (which these TVs use) quite well.

The logic signals from the board are 3.3V level. You only need TX/RX/GND and an RS232/USB adapter should handle that.

I am not sure what you will be do once you log in - you may be able to copy the panel files from another firmware image.

That is the correct device yes. You do not need to cut up a scart cable; wiring pins directly into the scart should work fine.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

This is probably something for an advanced user, not someone trying to fix their TV without much experience. You will need to know Linux (which these TVs use) quite well.

The logic signals from the board are 3.3V level. You only need TX/RX/GND and an RS232/USB adapter should handle that.

I am not sure what you will be do once you log in - you may be able to copy the panel files from another firmware image.

That is the correct device yes. You do not need to cut up a scart cable; wiring pins directly into the scart should work fine.

Alright cool I'll buy one of these and might just order the main av board too one that actually still powers on then try work with it. This one doesn't seem to boot at all now so I probably wouldn't get anywhere with it unless the bootloader would load.

I fix PCs all the time and I do know a little bit about Linux also. Enough that I know the file/folder structure and would know how to replace a few files if I had to. Since I know the panel type I can just try get another vestel firmware and try using the panel files from that as you said.

Thanks for the info. I'll order them tonight and let you know how I get on so others that have a similar problem might get some info.

I have a PC in my shed with a com port and xp installed but would that get me anywhere or like you said I'd need the 3.3v power that would probably lack. I'll order one of the usb to have anyway but was wondering if that would do anything for now.

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

You can unpack the 17MB6x files as SquashFS images; easy on Linux, not sure how to do on Windows, but I think 7-Zip supports them. Panel files should be in there.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

You can unpack the 17MB6x files as SquashFS images; easy on Linux, not sure how to do on Windows, but I think 7-Zip supports them. Panel files should be in there.

I have a few spare laptop hdd lying around if I have to put Linux on one and stick it in my PC. I'll try the 7zip method first but either way I'll have to get a replacement board without an spi flasher since it doesn't look like it's even loading the bootloader anymore. It's only cheap for a board but it still likely will have the same panel problems since I won't be able to get one with the right firmware either.

I'll get one that still boots and use uart to work with that if I can't find a working firmware. I'll also be making sure not to put mboot on any USB sticks to avoid it bricking the replacement one.

EDIT: Seems like the panel is LGE370WUN-SCC1

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

I got another board off a sharp tv and started it up and had wrong colours so I tried a firmware called 1.4.2 from one with an LG panel and left out mboot and now this board is the same and won't boot either. What's going wrong here is it leaving out the mboot that's breaking it?

I thought it would be the opposite but now both boards have no leds. Am I out of luck on both boards now having paid 42 euro?

The replacement board was from a sharp tv but has the right lcd connector.

EDIT: Can you reset the eeprom by shorting 2 pins?

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

Can't reset the EEPROM (it's not an EEPROM, it's a SPI flash, 8 pin device) but you can flash mboot onto it using an external SPI programmer or an Arduino with the right software.

You need to edit usb_auto_update.txt (or similar) if omitting mboot.bin. Otherwise, I don't know what it will do.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

Can't reset the EEPROM (it's not an EEPROM, it's a SPI flash, 8 pin device) but you can flash mboot onto it using an external SPI programmer or an Arduino with the right software.

You need to edit usb_auto_update.txt (or similar) if omitting mboot.bin. Otherwise, I don't know what it will do.

OK well what happened is I flashed the firmware by holding OK and then it started with no backlight. So then I pressed standby and got a red flashing light then went to restart by power cycling and the red light won't come on again. I didn't even use mboot but it's the same firmware I tried on the old board and when I had used mboot it booted. Do you think anything might even happen if I got that USB to uart adapter as I have one ordered?

If someone can give me a hand I don't mind donating to them because I'm not 100% sure what way to go about this. If I have to buy yet another board that's more money out of my pocket and I'd like to try get it to work as it's cheaper than a new tv.

It's a board from a sharp LC-40F22E and the only difference is one USB port instead of 2.

I only had usb_auto_update and mb61_en.bin on the USB and I can't even get it to flash again as it won't react to anything unfortunately

I found a firmware with the right panel information also but it's for a different vestel chassis 17MB65-1 V.2 if that's any use for getting the panel info into a 17mb61-2 firmware. I also still have the backed up nvram files. I'd be willing to pay if someone can make a firmware even though I'll probably have to buy another board again to use it if uart can't fix this.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

Also if nobody can help (which I don't blame them if they can't, would you trust this website as this has the part: http://euroservice2000.abc24.pl/?kat=53625&pro=705418

Please let me know if you vcan trust this site or find the part elsewhere. Thanks.

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

The problem you have is you are nuking the mboot
Even if you have no firmware on the TV the LED should still blink, at least initially
If mboot is gone you will need to desolder the chip and program it externally. You cannot flash it any more, it will not do anything, it has no firmware to recognise a USB.

If you do not include mboot on the USB then it is possible the bootloader will erase the mboot chip. I do not know. In any case I doubt you can just remove it from the file. You need to edit the .txt file.

Re creating firmware, we all work as volunteers, it is probably something you will have to hack together yourself, but you need mboot done first! That is the most important part. Then you can look at the firmware.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

The problem you have is you are nuking the mboot
Even if you have no firmware on the TV the LED should still blink, at least initially
If mboot is gone you will need to desolder the chip and program it externally. You cannot flash it any more, it will not do anything, it has no firmware to recognise a USB.

If you do not include mboot on the USB then it is possible the bootloader will erase the mboot chip. I do not know. In any case I doubt you can just remove it from the file. You need to edit the .txt file.

Re creating firmware, we all work as volunteers, it is probably something you will have to hack together yourself, but you need mboot done first! That is the most important part. Then you can look at the firmware.

OK so that's what my mistake was and I assume the text file told the tv to delete mboot but had no mboot to replace it with. It was an expensive enough mistake to make but I've learned my lesson now after doing it twice like an idiot

I went ahead and ordered another board but this time it's from a 42 inch LGEWUN-SCB1. I'm hoping that might be close enough to the 37 inch LGEWUN-SCC1 for the firmware to just work for me. The sharp board had Samsung panel info so I'm not surprised it didn't work.

Fingers crossed when the new one arrives that the panel is close enough to work. It doesn't matter about the service menu saying 42 instead of 37 if the tv ends up working.

Thanks for the help and if this new one doesn't work I'll have my UART USB device by then if anyone can give me a hand with setting that up so I don't brick yet another one.

At least I've learned something while burning a hole in my pocket

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

Also one last question. Can you use these points here in the attatched image to program the chip without desoldering? These seem to be right behind the chip but I have to get my hands on a programmer to write to it anyway.

Fixed the attatched picture. There's only 7 points but I assume the other is probably ground I'll have to check with a multimeter.

[tom66]

Re: Vestel 17mb61-2 I screwed up my TV

I have no idea. You would need to check the schematic as to what they refer to. Quite possibly you can.

[oldschoolgamer]

Re: Vestel 17mb61-2 I screwed up my TV

It's an I2C programmer for programming the likes of bios chips I need right? This is only for experimenting anyway now as I ordered a new board but I might get some money back by selling these on cheap if I get them booting or even just keep them as spare just in case.

I'll look for the schematics anyhow.